DEFIM vs Accoste
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DEFIM
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Defim est une application mobile dédiée à la préparation du permis bateau côtier. Elle vous permet d’apprendre, réviser et tester vos connaissances grâce à des cours structurés, des quiz interactifs et des examens blancs, directement depuis votre smartphone. Fonctionnalités principales : - Cours clairs et organisés par chapitres - Quiz interactifs (QCM & Vrai/Faux) - Examens blancs avec conditions réelles - Suivi de progression personnalisé - Accès réservé aux élèves DEFIM Contenu pédagogique : - Navigation côtière et cartes marines - Balisage et signalisation maritime - Feux et marques des navires - Règles de barre et de route - Météorologie marine - Sécurité et environnement Defim est conçue pour vous accompagner efficacement jusqu’à la réussite de votre examen, avec une expérience fluide, moderne et pédagogique. Naviguez en toute confiance. Réussissez avec Defim.
Accoste
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A berthing simulator, and the course that goes with it. Accoste reproduces what makes coming into a harbour hard: the momentum of five tonnes, the prop walk that throws the stern sideways in astern gear, the rudder that goes dead the moment you back up, the wind that puts the bow off the moment you lose steerage. You manoeuvre from above, at full scale, on a chart. SEVENTEEN MANOEUVRES Alongside a quay — getting the feel of her, berthing in calm weather, in an onshore wind, against a current, and springing off between two neighbours. Finger berths — a Breton marina at real dimensions: main pontoon, 8.4 m fingers, berths at 5.2 m centres, a 23 m fairway. Bow in, stern to, cross wind, and leaving with the wind pinning you on. Hard situations — force 5 downwind, a cross set, a neighbour backing out at the wrong moment, a jammed gearbox with no astern power, force 6 gusts, arriving at night, and rafting up on the visitors' pontoon. WHAT THE MODEL REPRODUCES Prop walk, to be checked before anything else. Prop wash over the rudder, which gives you steerage at zero speed going ahead and nothing at all going astern. The pivot point, calculated in real time — not drawn a third of the way back: it moves with the way she carries, and you watch the stern swing. Mooring lines under real tension, each pulling on its cleat with its own lever arm: forward spring, engine ahead, helm to seaward genuinely holds the boat still, and springing off genuinely works. OBJECTIVES THAT ARE MEASURED Every exercise marks itself. Contact speed is measured in metres per second. Impacts are counted. And making the bow line fast instead of the spring does not tick the box — because it does not work on the water either. THE COURSE Ten chapters: how to use the course, the vocabulary aboard, the names of the lines and what each one forbids, the five effects that account for failed manoeuvres, the five-minute check before going in, the manoeuvres one by one, locking in, lying against a tidal wall, the classic mistakes, the exercises to do offshore before your first entry, and a crib sheet to laminate. Plus a ten-question quiz, with the reasoning after every answer. HONESTLY The hydrodynamic constants are eyeball-calibrated for an 11.4 m yacht. The orders of magnitude are right; the feel is no substitute for twenty minutes of real practice in clear water, nor for checking the prop walk on your own boat. ASKING FOR NOTHING No account. No network. No data collected, no trackers, no advertising. Everything runs on your iPhone, including at sea, out of signal. Four manoeuvres and two chapters are open. The rest opens with a single purchase, no subscription: the content is finite, and it stays yours.
Screenshots
Verdict
The clearest difference is device support: DEFIM at 3 against Accoste's 1. DEFIM also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
DEFIM ships an update every 11 days, Accoste weekly. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.
| Parameter | DEFIM | Accoste |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 11 days | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 27 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | DEFIM SA | FOSS4EU |
In-app purchases
DEFIM
No in-app purchases
Accoste
No in-app purchases








