F Numbers vs Lazmi AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
F Numbers
Quickly find filler metal groupings for welding procedures and performance qualifications. Access classifications with descriptions of intended use, based on ASME and AWS standards.
- Filler metal grouping lookup
- Welding procedure qualification
- Performance qualification data
- Classification descriptions
- ASME Section IX data
- AWS standards data
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F Numbers: Quick lookup of filler metal groupings for welding procedure and performance qualification. Lookup includes classifications with respective descriptions of intended use. Data is provided by C-spec. F-numbers and A-numbers assignments are based on ASME Section IX Table QW-432 and QW-442, ASME Section II Part C, AWS B2.1 Table B1 and B2, and AWS A5.1 through AWS A5.36.
Lazmi AI
This app crafts emails and texts that sound authentically like you by learning your unique writing style. It offers modes for professional communication and casual conversations, ensuring your messages maintain your personal tone and phrasing.
- Learn and save personal writing styles
- Generate emails in your voice
- Reply to texts in your style
- Pro Mode for professional emails
- Fun Mode for dating and casual texts
- History of generated content
- Privacy-focused data handling
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Most AI writing tools make everyone sound the same: polished, generic, and easy to spot. Lazmi writes like you. Tell Lazmi how you write, or paste a few messages you've actually sent, and save it as your style. Lazmi matches your tone, phrasing, and punctuation, so every message sounds like you on your best day. Pro Mode: Emails Say what you need and get the email. Write client updates, follow-ups, cold outreach, and replies in your own style. Choose brief or detailed, casual or formal. Paste the email you're replying to and Lazmi answers in context. Fun Mode: Dating & Everyday Texts Paste their text and get a reply that fits the moment. Dating has Male and Female modes and a Quick reply for when you just need something good, fast. Not feeling it? Hit Regenerate. Why people use Lazmi: • Your own saved styles, not generic templates • Sounds like you, not AI • Emails and texts in one app • Full history of everything you generate • Privacy-first: your data is never sold Free to try. No card required. Terms of Service: https://terms.lazmi.ai Privacy Policy: https://privacy.lazmi.ai
Screenshots
Verdict
The clearest difference is in-app purchases: F Numbers at none against Lazmi AI's 10. Lazmi AI's advantage is update cadence (every 2 weeks vs every 13 months) and ratings volume (15 vs 3). On price, rating, 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. Lazmi AI sells 10 in-app purchases, starting at $3.99 per 7 days. F Numbers asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for F Numbers against 5.0 for Lazmi AI. That said, the two scores are not equally well evidenced: Lazmi AI has 15 ratings behind it against 3, so its average is the more settled of the two.
F Numbers ships an update every 13 months, Lazmi AI every 2 weeks. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.
| Parameter | F Numbers | Lazmi AI |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) | 5.0 (15 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 3 | 15 — better |
| Update frequency | Every 13 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 15 MB | 81 MB |
| Age rating | 4+ | 4+ |
| Developer | ASMEIX CORPORATION | Lazmi.ai LLC |
Customer experience
F Numbers
Lazmi AI
In-app purchases
F Numbers
No in-app purchases
Lazmi AI
- Fun Mode Weekly3 Days trial$3.997 Days
- Pro Mode Weekly$3.997 Days
- Fun Mode Basic1 Month trial$8.991 Month
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- Pro Mode Basic1 Month trial$8.991 Month
- Fun Mode Basic$8.991 Month
- Pro Mode Basic$8.991 Month
- Fun Mode Plus$16.991 Month
- Pro Mode Plus$16.991 Month
- Pro Mode Ultra$34.991 Month
- Fun Mode Ultra$49.991 Month
