27
BU Score
Niche
Zinsrechner
✍️ bumetric analysis
“
Zinsrechner is an iOS app from Piet Jonas in the Finance category, currently rated 2.5★ across 2 ratings. Initial signal reads as mostly critical sentiment so far: users flag rough edges and unmet expectations.
Our BU Score puts it at 27: Niche (micro-niche or pre-traction stage). For a Finance app, that means micro-niche or pre-traction stage.
Track changes month-over-month in the Performance section below: live snapshot history and revenue forecast included.
📊 Performance Tracking LIVE
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
Range:
💰 Forecast Revenue / mo
MODELRevenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 5 of 5 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Paid app ($0.00)METRIC | +$2,800 | |
| Below-average rating (2.5★)METRIC | −$1,500 | |
| Mature app (17y old)METRIC | +$1,500 | |
| Single-language (English only)METRIC | −$400 | |
| Pre-traction phase (2 ratings)METRIC | −$300 |
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)
📈 Reviews Growth
LIVECumulative review count from first BU snapshot. Each point = a tracked update.
⭐ Rating Trend
LIVEAverage rating evolution. Updates with each new review batch.
🗓️ Snapshot Timeline
HISTORYEach bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →💾 5 MB🔞 4+📱 iOS 11.0+🔖 v1.3.2🔄 updated 2y ago🌐 EN📂 Finance💰 Paid🚀 Launched 2008 (17y old)
📝 About this app
This savings calculator helps to find out how much interest you will get when you invest your money over a given period of time with a fixed interest rate. It calculates the compound interest which means it assumes you reinvest the interest after each year (or just leave it in the bank account). So you will profit from the interest you earn on interest you already got.
You can calculate any value in the interest equations, so that you can find out how much interest rate or how many years are necessary to reach a certain goal. As well you can find out how much money you need to start with. This is perfect for doing "what-if" analysis.
You can calculate any value in the interest equations, so that you can find out how much interest rate or how many years are necessary to reach a certain goal. As well you can find out how much money you need to start with. This is perfect for doing "what-if" analysis.
🆕 What's New · v1.3.2
- bugs fixed
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Zinsrechner
- Developer
- Piet Jonas
- Bundle ID
- com.speedymarks.apps.Savings
- App Store URL
- Open in App Store
- Category
- Finance
- Content rating
- 4+
- Languages
- EN
Company
- Website
- savings.speedymarks.com
- Tagline
- Not found
- Description
- Not found
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- Not found
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- ML model estimate / mo
- $287/mo
- Top-grossing rank
- Outside top 100 in US Finance
- All-time revenue
- Not found
- Pricing
- Not found
Founder
- Name
- Not found
- X / Twitter
- Not found
- Not found
- GitHub
- Not found
- X followers
- Not found
- Public statements
- Not found
Funding
- Total raised
- Not found
- Last round
- Not found
- Investors
- Not found
- Crunchbase
- Not found
- AngelList
- Not found
Press & Links
- Articles found
- Not found
- Listed on
- Not found
- Blog
- Not found
- Press / News
- Not found
Contacts & Socials
- Socials
- Not found
- savings@speedymarks.com
- Phone
- Not found
- Contact page
- Not found
- About page
- Not found
⭐Recent App Store Reviews7 latest · avg 1.14★ · 0% 5★ · 85.7% 1★
5★0 (0%)
4★0 (0%)
3★0 (0%)
2★1 (14%)
1★6 (86%)
Complaints: worst ×1 hate ×1
Top positive
★☆☆☆☆ Lame
This ap is not worth .99!!! It's hard to change the numbers and really offers no substance. Don't waste your money. I wish I could get mine back. I would have added another $ to my savings!!!!…
★☆☆☆☆ saving Calculator
default to alpha, not worth it, number pad needed, needs other inputs, daily, weekly…
Top negative
★☆☆☆☆ The Worst
Do not buy!!!!…
★☆☆☆☆ I don't get it
quickest waste of 99 cents ever. It does nothing. Doesn't deserve the 1 star but won't let me submit unless I give at least one…
📈Ratings growth2 ratingsShow 3-year history estimate ▾
Tracked (1 weeks) Pre-tracking estimate (37 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
Full revenue analysis
Read the article-style breakdown for Zinsrechner: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.