Free
All tools, limited Barge Visualizer, 1 demo vessel, no saved voyages
Free
- 1 demo vessel
- No saved voyages
- 3D digital twin
Vessel Stowage Planner
Stowage planning software for every type of vessel
Plan Cargo. Balance Vessel. Sail Safer. One Stowage Platform for Every Vessel Size.
Plan the cargo, balance the vessel and send a checked plan on board. One web platform for ship planners, chief officers, superintendents and fleet operators.
Shore-side planning & decision support. The class-approved onboard loading computer remains the official reference.
- IDMAKMakassar × 44
- IDBPNBalikpapan × 46
- IDTRKTarakan × 58
- Reefer
- DG
- Slot compatibility
- Heavy containers below
- POD sequence, no restows
- Reefers on plugged slots
- Stability & strength from the deterministic engine
Problems we solve
Ship plans are still built in Excel, checked late and approved over chat
Spreadsheets don’t know the ship’s limits
Stack weights, deck loads in t/m², reefer slots, free heights and minimum GM are only found to be exceeded when the plan reaches the ship’s loading computer.
Stability comes last
Planners stow first and calculate later. One booking change forces a manual recalculation of draft, trim and longitudinal strength.
Restows and multi-port rotations
Domestic rotations call at many ports. A wrong discharge sequence means extra crane moves, longer port stays and cost.
Approvals without a trail
Plans bounce between office, ship and HQ by email and WhatsApp. Which version the master approved is often unclear.
Three engines at the core
Constraints, stability and optimisation — one source of truth
The manual planner, auto stowage and the approval flow all call the same engines. AI only explains results; it never places cargo or calculates stability.
Constraint engine
Deterministic rules with a code, a level (block/warn/info), bilingual messages and a source — identical in the browser, on the server and in tests.
- Slots, stack weights, deck & hold loads
- POD sequence, Ro-Ro/LCT discharge order
- DG from licensed or company rule sets
Stability & strength engine
Computed from your vessel’s hydrostatic and KN tables (interpolated) and tested against the loading conditions in the stability booklet.
- Draft F/A/M, trim, heel, corrected GM
- GZ curve & intact stability criteria
- SF/BM per frame, air draft, line of sight
Auto stowage optimiser
The AUTO PLAN button returns four options, all of them already passed by the same constraint and stability engines.
- A — fastest port operations
- B — best stability · C — fewest restows
- D — balanced (default), weights per company
Modules per vessel type
One core, a cargo-space module for every vessel type
Each module brings its cargo-space definition, rule validator, weight & moment contribution to the stability engine, 2D & 3D views, PDF report and test data.
- Rollout wave 2
Container ship
Bay–row–tier planning, multi-port POD sequence, reefers, DG and VGM for domestic feeders.
See the solution - Rollout wave 1
General cargo & breakbulk
Holds, tween decks and deck for mixed inter-island cargo: tank top loads, separation, discharge order.
See the solution - Rollout wave 3
Bulk carrier
Pour and deballasting sequences, SF/BM per stage and draft surveys for bulk carriers and coal barges.
See the solution - Rollout wave 1
Barge
Deck layouts for 180–330 ft barges: t/m² deck load, CoG, trim and sea-fastening for coal and project cargo.
See the solution - Rollout wave 1
LCT (landing craft)
Heavy equipment order, ramp and axle loads, and beaching trim for mining and island logistics.
See the solution - Rollout wave 3
Ro-Ro and ferry
Lanes per deck, lane metres, axle loads, clear height and drive-on order for Ro-Ro ships and ferries.
See the solution - Rollout wave 4
MPP & heavy lift
Crane SWL and outreach curves, heel during the lift, grillage and sea-fastening for heavy cargo on MPPs.
See the solution - Rollout wave 4
Project cargo
Irregular cargo, lifting points and vessel combinations (MPP, barge, LCT) for EPC and mining projects.
See the solution
Modules roll out in stages: barge, LCT & general cargo first, then container, then bulk & Ro-Ro, then MPP, heavy lift & project cargo.
Workflow
From vessel model to an approved final plan
Every step uses one vessel model and the same engines, so manual and automatic plans are checked with the same formulas.
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Vessel Builder
Build your vessel: identity, dimensions, hydrostatics & KN from the stability booklet, tanks and cargo spaces.
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Voyage
Port rotation per leg, cargo from Excel, API or EDI, VGM and DG normalised.
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Planner
Drag & drop into slots or zones; the constraint engine blocks or warns instantly.
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Stability
Draft, trim, heel, GM, GZ, criteria and SF/BM per leg from a deterministic engine.
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Approval
Planner → Chief Officer → Superintendent → Master, every decision logged.
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BAPLIE & PDF
Hashed stowage plan PDF, BAPLIE/MOVINS re-validated before sending.
- Cargo in suitable zones
- Cargo CoG close to target
- Stability & strength from the deterministic engine
- Discharge order matches the ramp
- Cargo CoG close to target
- Stability & strength from the deterministic engine
Illustration with a fictional vessel and sample data — not a stability calculation result.
Fleet Stowage Control Tower
Your whole fleet on one screen
For companies with many vessels: voyages by status, alerts by level, latest stability criteria status, missing VGMs and plans awaiting approval — updated in real time.
- Click a vessel to open its plan and alerts
- Real-time collaboration: cursors, bay/zone locks, comments per slot
- Offline mode for review on board, syncs when back online
- 3D digital twin for presentations and reports
Fleet Stowage Control Tower Illustration
- Vessels
- 3
- Active voyages
- 3
- Alerts
- 3
- Awaiting approval
- 1
| Demo Feeder 600 TEU | Loading | 2 Alerts |
| Demo Barge 300 ft | Chief officer review | 1 Alerts |
| Demo LCT | Sailing | — |
Safety & validation status
Honest about limits: shore-side planning until class approval
Stability comes from a deterministic engine tested against the vessel’s stability booklet. Until the module is approved by a classification society, all output is shore-side planning & decision support.
Data status of every vessel
- Draft
Data just entered. Stability figures show a red “not validated” label.
- Internally verified
Checked by your team against the ship’s documents. The warning label stays.
- Verified by naval architect
Source documents uploaded and engine results match the booklet conditions within tolerance.
Vessel data not yet validated — do not use for operational decisions.
- Every vessel is tested with the loading conditions from its stability booklet; the comparison report is stored with the vessel.
- Engine changes that move results outside tolerance fail the build (automatic regression).
- Existing plans stay locked to the vessel model version they were created with.
- PDFs state that the approved onboard loading computer remains the official reference.
Shore-side planning & decision support. The class-approved onboard loading computer remains the official reference.
The path to an official loading instrument (IACS UR L5, Rec. 48) is a separate business decision; the architecture is prepared for it.
Integrations
Data in from anywhere, out in standard formats
Every channel is normalised into one cargo list before the engines use it. Integrations use scoped API keys and an audit log.
API /v1/vessel
Vessels, voyages, idempotent cargo batches, optimisation, stability and BAPLIE export. Webhooks plan.approved, plan.final, stability.alert, vgm.missing.
UN/EDIFACT EDI
BAPLIE 2.x & 3.x, MOVINS, VERMAS, COPRAR/COARRI, TANSTA following SMDG guides; exports are re-validated before sending.
Excel & CSV
Templates per vessel type, automatic column mapping, row validation and error reports.
Manifest extraction
Manifest PDFs or photos become structured items — always confirmed by the user before use.
Integration targets: terminal TOS, ERP, ship management, fleet management, booking systems and port systems. Developers →
Pricing
Per-vessel pricing local operators can afford
Start free with the tools and one demo vessel, then move to per-vessel, Fleet or Enterprise plans.
Vessel Stowage plansVessel Stowage
Per-vessel pricing for the vessel module, separate from the Cargo Studio plans. Launch prices, validated with pilot customers.
Ship Planner Pro
Individuals/consultants: 2 vessels, unlimited voyages, PDF, no approval workflow
$59 /user/month
Excluding VAT.
- 2 vessels
- 1 users
- Unlimited voyages
- Stowage plan PDF
- Offline mode
- 3D digital twin
Barge/LCT
For barge & LCT fleets, per unit, minimum 3 units
$89 /unit/month
Minimum 3 units · Excluding VAT.
- 3 vessels
- 5 users
- Unlimited voyages
- Approval workflow
- Stowage plan PDF
- Real-time collaboration
Vessel
One vessel, every module for its type, 5 users, approvals, EDI
$179 /vessel/month
Excluding VAT.
- 1 vessels
- 5 users
- Unlimited voyages
- BAPLIE/MOVINS EDI
- Approval workflow
- Stowage plan PDF
Fleet
From ≤ 10 vessels: Control Tower, quota-based auto stowage, API, SSO, company rule sets
From $899 /month
Excluding VAT.
- 10 vessels
- 50 users
- Unlimited voyages
- 300 auto stowage runs/month
- Fleet Control Tower
- API & webhooks
- SSO
Enterprise
Unlimited vessels, SLA, TOS/ERP integration, validation support
Contract
- Unlimited vessels
- Unlimited users
- Unlimited voyages
- Auto stowage per contract
- Fleet Control Tower
- API & webhooks
- SSO
14-day trial on paid plans, starting with a demo vessel built on synthetic data. Annual = pay 10 months. Auto stowage quota and AI credits beyond the plan are sold separately.
Vessel Onboarding (one-off): IDR 5,000,000 – IDR 25,000,000 · Enterprise implementation: IDR 25,000,000 – IDR 500,000,000
Shore-side planning & decision support — the class-approved onboard loading computer remains the official reference.
Knowledge centre
Vessel stowage guides
Practical articles on bay plans, stability, trim, restows, VGM, DG, BAPLIE, barges, LCTs and more.
Related guides
- Container Ship Bay Planning: Pre-stow, POD Blocks and Stack Limits
- Ship Stability Basics for Planners: Displacement, KG, GM and the GZ Curve
- Metacentric Height (GM) Explained: Calculation, Corrections and Limits
- Ship Trim and Draft: TPC, MTC, LCF and a Worked Example of New Drafts
- Container Restows: Causes, Costs and How to Reduce Them in the Bay Plan
- VGM in Vessel Stowage Planning: Discrepancy Thresholds, Hold Status and VERMAS
- Dangerous Goods Stowage on Ships: Classes, Segregation, Stowage Categories, DG Manifest
- BAPLIE EDI Explained: SMDG 2.x vs 3.x, Segments and Bay Plan Validation
- Deck Cargo Barge Stowage (180–330 ft): Deck Load, CoG, Trim and Sea-Fastening
- LCT Loading Guide: Bow Ramp, Heavy Equipment Order, Axle Loads and Beaching Trim
- General Cargo and Breakbulk Stowage: Holds, Stowage Factor and Discharge Order
- Heavy Lift Cargo Stowage: Ship Cranes, Heel During the Lift and Sea-Fastening
- Ro-Ro and Ferry Stowage Planning: Lane Metres, Axle Loads, Ramps and Vehicle Lashing
- Bulk Carrier Loading Sequence: Pours, Deballasting, Longitudinal Strength and Draft Survey
- Container Lashing on Ships: Twistlocks, Lashing Rods, Stack Weights and Roll Forces
- Bridge Visibility and Line of Sight: SOLAS V/22, Deck Stack Height and Trim
- Shear Force and Bending Moment: Hogging, Sagging and Longitudinal Strength Limits
- Deck, Hatch Cover and Tank Top Strength: UDL, Point Loads and Load Spreading
- Multi-Port Stowage Planning: POD Sequencing, Reserved Slots and Per-Leg Conditions
- Onboard Loading Computer vs Shore-Side Planning: Class Approval and Reconciliation
Frequently asked questions
Does Stowage.id replace the ship’s loading computer?
No. Until the module is approved by a classification society, Vessel Stowage is a shore-side planning & decision-support tool. The class-approved onboard loading computer and the stability booklet remain the official reference; our plans help you prepare and check earlier.
Which vessel types are supported?
One core for container ships, general cargo/MPP, bulk carriers, barges, LCTs, Ro-Ro, heavy lift and project cargo. Modules roll out in stages: barge, LCT and general cargo first, then container, then bulk, Ro-Ro, MPP, heavy lift and project cargo. Tankers and gas carriers are not supported.
Where does my vessel’s hydrostatic data come from?
From your vessel’s stability booklet: hydrostatic tables, KN/cross curves, tanks and strength limits are imported via Excel/CSV in the Vessel Builder. Our onboarding team can help model the vessel and validate it against the booklet conditions.
Does AI build the plan or calculate stability?
No. Cargo positions come from the planner or the optimiser, and every stability figure comes from a tested deterministic engine. AI only explains results in plain language and helps import data that you must confirm.
Can it be used on board without stable internet?
Yes, for review: offline mode (PWA) lets the chief officer review the plan on board, then sync when back online with conflict detection.
What about dangerous goods (IMDG) data?
The IMDG Code text and tables are IMO copyright, so we don’t copy them. The DG engine reads rule sets from licensed data sources or rule sets you enter yourself, then applies segregation in the plan.
How much does it cost?
There are Free, Ship Planner Pro per user, Barge/LCT per unit (minimum 3), Vessel per ship, Fleet from 10 vessels, and Enterprise plans. Vessel onboarding (modelling & validation) is a one-off fee by vessel type. Full prices are on the pricing page.
Can I try it first?
Yes. Paid plans come with a 14-day trial, and you can start with a demo vessel built on synthetic data. For your own vessel, request a demo and we will help prepare its model.
Plan Cargo. Balance Vessel. Sail Safer.
See Vessel Stowage with your own vessel
Book a demo with your vessel data, or start a trial with a demo vessel.
14-day trial on paid plans, starting with a demo vessel built on synthetic data.