FlexicX vs Engine Sim
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
FlexicX
Experience unparalleled softbody destruction with a cutting-edge physics engine. Engage in interactive crash tests with lifelike car models that crumple, bend, and break in real-time. Optimized for mobile, this game offers a dynamic and immersive destruction simulation.
- Realistic softbody physics
- Dynamic car deformations
- Interactive crash tests
- Lifelike car models
- Optimized mobile performance
- Unique crash scenarios
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Welcome to a world where every collision feels real, every deformation is dynamic, and every crash is breathtakingly authentic. Powered by FlexicEngine, the cutting-edge physics engine developed by SIDGIN, this game delivers an unparalleled softbody destruction experience. Each crash is a unique spectacle, with cars reacting to impacts as they would in real life. Why FlexicEngine? • Super Realistic Physics: FlexicEngine simulates the behavior of flexible materials with incredible precision, bringing a new level of realism to softbody dynamics. • Immersive World: Every car crumples, bends, and breaks in real-time, creating a lifelike experience that pulls you into the action. • Optimized for Mobile: Despite its advanced physics, the game runs smoothly on most mobile devices, ensuring a seamless gaming experience. What Awaits You: • Interactive Crash Tests: Engage with diverse obstacles, from steel barriers to massive walls, each designed to test the limits of destruction. • Lifelike Car Models: Every vehicle is crafted with attention to detail, responding to crashes with realistic deformations and damage. • Dynamic Challenges: Tackle unique crash scenarios that push your driving and survival skills to the edge. Support Our Mission! We’ve just launched this ambitious project and need your feedback to make it even better. Creating realistic softbody physics on mobile devices is a massive challenge, but with your help, we’re determined to perfect it. Download now and experience the power of FlexicEngine. Become the master of crash tests in the most realistic softbody simulator ever created! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Engine Sim
Experience realistic engine sounds with interactive controls. Explore a variety of engines, from kei cars to V12s, and feel the vibrations. Practice gear shifting and rev-matching for an immersive automotive simulation.
- 10 realistic engine sounds
- Interactive throttle control
- Live engine sound generation
- Straight-pipe mode
- Haptic feedback
- H-pattern shifter and paddles
- Rev-matching practice
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Press the pedal and the engine roars for real. Just move your finger and 28 different engines come alive — from a 660cc turbo kei car to a W16 hypercar, all the way to a racing V10 that screams to 19,000 rpm. It's a new kind of toy you can just pick up and play. No complicated setup. Drag across the screen and feel how good a good engine sounds. SIMPLE TO PLAY, DEEP IF YOU WANT IT - 28 engine sounds: V-twin, turbo kei car (660cc), inline-4, inline-5, inline-6, boxer-4, flat-6, V6, cross-plane and flat-plane V8s, V10, V12, W16, and a racing V10 to 19,000 rpm - A throttle that reacts to exactly how hard you press: ease in for a soft idle, floor it for a full-throttle scream - Every sound is made live, not a recording on loop — so the same rev never sounds exactly the same twice - Straight-pipe mode in the chassis tuning screen: open up the exhaust for more pops and bangs on lift-off - Haptics that pulse with the revs, so you feel the engine in your hand - Color RPM gauge with a rev-limiter cutout FOR CAR PEOPLE, THERE'S MORE - An H-pattern shifter (switch to paddles anytime) so you change gears yourself - Practice rev-matching: brake, blip the throttle, shift. Nail it and it's smooth; botch it and you feel the driveline thump - Per-cylinder firing and uneven exhaust timing keep it from ever sounding like a loop - Tune each engine: spend miles earned by driving on mufflers, intakes, headers, superchargers, cams and ECU maps, and see your 0–100 km/h (0–62 mph) time, top speed and torque change on the spot - Chassis tuning shared across every engine: weight reduction, aero and a lighter flywheel - A Parts Crate for extra parts, with the odds shown in the app - Garage miles keep accruing even while the app is closed - A Pit Stop summary after every drive: distance, miles earned, and any personal bests - Daily tasks, a login bonus, and achievements you can trade in for perks - Game Center leaderboards for top speed and 0–100 km/h - Invite friends with a referral code for bonus miles WHO IT'S FOR - Anyone who loves engine and car sounds - Anyone who wants a bit of fun tinkering with a car while waiting or on the go - Fans curious what a V12 or flat-6 sounds like without owning one - Drivers who want to practice rev-matching before getting behind the wheel AVAILABILITY You start with the inline-4 and every core feature, with no ads on the driving screen. Driving earns miles that unlock the remaining engines and parts through the unlock tree. The next unowned V6, V8 or V12 engine can be rented for 10 minutes after a short video ad, and straight-pipe mode can be unlocked for 24 hours the same way. An optional one-time purchase removes the full-screen ads shown between engine switches; rentals, straight-pipe trials and mile rewards stay available either way. No subscriptions. Tip: headphones or earphones bring out the fine detail in every sound.
Screenshots
Verdict
The clearest difference is rating: FlexicX at 4.8 against Engine Sim's 4.6. FlexicX also leads on ratings volume (12K vs 1.1K) and device support (3 vs 1). Engine Sim's advantage is update cadence (every 3 days vs every 8 days). On price, review sentiment, 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. FlexicX sells 7 in-app purchases, starting at $2.99 per month and Engine Sim sells 15 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
FlexicX holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: FlexicX has 12K ratings behind it against 1.1K, so its average is the more settled of the two. Written reviews point the same way: 88% of FlexicX's written reviews are positive against 86% of Engine Sim's.
FlexicX ships an update every 8 days, Engine Sim every 3 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | FlexicX | Engine Sim |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (12K ratings) — better | 4.6 (1.1K ratings) |
| Positive reviews | 88.1% of reviews — better | 85.7% of reviews |
| Number of ratings | 12K — better | 1.1K |
| Update frequency | Every 8 days | Every 3 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #134 | #86 — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 1.2 GB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | SIDGIN LLC | Sena Takasawa |
Customer experience
FlexicX
Engine Sim
Bugs and requests
FlexicX
Reported bugs
5 issues- Mustang engine model issues
- Machforce GT button bug
- Inability to link Game Center account
- Garage texture loading issues
- Limited maps and terrain options
Requested features
4 requests- Add more maps and terrain options
- Improve ways to earn in-game currency
- Fix bugs with unlocking certain cars
- Optimize performance and stability
Engine Sim
Not enough reviews yet to summarise bugs or requests.
In-app purchases
FlexicX
- Premium Silver$2.991 Month
- Gold 100$1.99
- Gold 300$3.99
- Gold 700$6.99
Show 3 moreShow fewer
- Gold 1000$9.99
- Gold 5000$39.99
- Gold 15000$99.99
Engine Sim
- V6 Grand Tourer$1.99
- Starter Pack$1.99
- Quick Shifter$1.99
Show 12 moreShow fewer
- Big Radiator$1.99
- Over-Rev Kit$1.99
- Single 450 Moto$1.99
- Today's Engine (I6/V8)$1.99
- Big Bore Kit$2.99
- Custom Gearbox$3.99
- Diesel Truck Inline-6$4.99
- Today's Engine (V10/V12)$4.99
- Straight Pipe$5.99
- W16 Hypercar$9.99
- Pro Parts Pack$9.99
- Unlock Everything$49.99









