iEngineer vs LangBelta
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iEngineer
Access a vast database of screw and bolt information, including dimensions, material grades, and strength properties for both US and metric fasteners. Features a comprehensive drill chart, unit conversion, and customizable material displays.
- Extensive US screw database
- Metric screw database (in-app purchase)
- Detailed dimensions and material grades
- Strength, torque, and clamp force data
- Head markings and 3D head models
- Comprehensive drill chart
- Unit conversion and data export
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iEngineer is the most comprehensive database of screw/bolt information that you can find anywhere. US screws: -93 different screws from #0 to 4” -Dimensions for 9 standard head styles -74 material grades including SAE, ASTM, and other materials Metric Screws (available as in-app purchase): -210 different metric screws from M1.0 to M100 -Dimensions for 10 standard head styles for ISO, DIN, BS, and ANSI standards where available -86 material grades including 12 additional metric grades, SAE, ASTM, and other materials Displayed values for both the US and Metric screws include: -Standard dimensions -Tap sizes -Clearance hole sizes -Material strength -Recommended torque values -Clamp force -Shear force -Head markings display -3D model of head type -Standard dimensions of head type Other features: -Drill chart with 523 drill bit sizes -Fraction chart -Copy and paste data values -Fast and easy unit conversion -Ability to show/hide material grades in the interface so you only see what is relevant to you If you have any questions please contact us at support@perfectlysimpleapps.com
LangBelta
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LangBelta is a dictionary and translator for Lang Belta, the constructed creole created by Nick Farmer for The Expanse. BROWSE THE DICTIONARY Every word entry, listed alphabetically. Filter to a single letter to jump straight to it — accented letters are filed under their unaccented parent, so Á sits with A. Words that share a spelling but differ in meaning are shown together and numbered, rather than the app picking one for you. LOOK UP A MEANING Search in English to find the Lang Belta word for it. Each word entry shows its part of speech, its English meaning, and cross-references to related words. TRANSLATE Translate free text between English and Belter Creole in either direction. Translations are generated by a language model, so they will not always be right — anything that looks wrong or offensive can be flagged from the translation itself with a single tap. SHARE Any word entry can be shared as a link that opens straight back to that word. BUILT TO STAY OUT OF YOUR WAY No account. No sign-in. No ads. No analytics, no tracking, and no advertising identifiers. Light and dark themes follow your system setting. A NOTE ON PRIVACY Text you submit for translation is sent to Google's translation model and stored so that repeating a phrase costs nothing — don't type anything private into it. Words you look up in the dictionary are never stored. The full policy is at https://langbelta.hangar279.com/privacy, and you can ask for a stored phrase to be deleted. UNOFFICIAL This is an independent fan project. It is not affiliated with, endorsed by, or sponsored by the creators, authors, or rights holders of The Expanse. Lang Belta was created by Nick Farmer.
Screenshots
Verdict
The clearest difference is in-app purchases: LangBelta at none against iEngineer's 1. LangBelta also leads on update cadence (every 3 weeks vs every 5 months) and iOS requirement (15.0 vs 26.0). On price, ads and device support 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. iEngineer sells 1 one-off in-app purchase. LangBelta asks for nothing beyond the download.
iEngineer ships an update every 5 months, LangBelta every 3 weeks. The most recent releases landed on October 29, 2026 and October 21, 2026 respectively.
| Parameter | iEngineer | LangBelta |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (200 ratings) — better | — |
| Positive reviews | 85.5% of reviews | — |
| Number of ratings | 200 — better | — |
| Update frequency | Every 5 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 12 MB | 18 MB |
| Age rating | 4+ | 12+ |
| Developer | Perfectly Simple Apps LLC | Erik Drysen |
Bugs and requests
iEngineer
Reported bugs
2 issues- Metric portion not working for some users
- Camera access request for no apparent reason
Requested features
4 requests- Add tap drill chart
- Include clearance hole fits
- Improve UI for larger displays
- Add French language support
LangBelta
Not enough reviews yet to summarise bugs or requests.
In-app purchases
iEngineer
- Metric Screws$1.99
LangBelta
No in-app purchases






