Invoice Simple: Rechnung
84
Quality Score
Excellent
Invoice Simple: Rechnung
High confidence
✍️ bumetric analysis
“
Invoice Simple: Rechnung is an iOS app from Zenvoice Inc. in the Business category, currently rated 4.9★ across 122,406 ratings. Initial signal reads as mostly critical sentiment so far: users flag rough edges and unmet expectations.
Quality Score is 84: Excellent (strong product-market fit). For a Business app, that means strong product-market fit. The full BU Investment Matrix below scores 8 dimensions including monetisation, growth, and operational risk.
Track changes month-over-month in the Performance section below: live snapshot history and revenue forecast included.
💰 Monthly revenue · now vs forecast
● Right now
$1.4M
per month
→
12-mo forecast
$1.5M – $2.3M
per month
→
24-mo forecast
$1.8M – $3.3M
per month
BIG tier
💡 Grow this revenue
Free AI audit of this app’s store listing
- Title & subtitle keyword fit
- Description hook & conversion structure
- Screenshots, ratings, reviews strategy
Typical impact: +2-5× organic installs
📊 Performance Tracking LIVE
Loading…
Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
ONE-TIME · BUILD
💰 Estimated build cost
$135K
↳ What it cost to build · not monthly revenue
Likely range $100K – $180K
$25K · MVP floor
$100K · indie scale
$500K+ · studio build
📈
Pays back in ~6 months at current MRR
Synthetic estimate. Inputs: category complexity, file size, screen count, monetization layer, platform reach, age × team-size proxy. Calibrated against 2024-2026 indie-agency rate surveys. Full math + source list on /methodology.
Where the money goes
| 🧱 MVP baseline (design + 1-store ship) | +$28K |
| 📱 5 unique screens × $4.5K | +$22K |
| 📦 Asset bundle (201 MB) | +$40K |
| ⚙ Business complexity ×1.50 | +$45K |
Total estimate
$135K
ONE-TIME · EXIT VALUE
💵 Estimated acquisition value
$450K
↳ What it would sell for · not monthly revenue
Marketplace range $325K – $600K · 20× MRR multiple
💸
~3.3× return on build cost
Synthetic estimate. Multiple band derived from ad-supported + age, rating quality, category demand, and user-base maturity. Calibrated against 2024-2026 indie-app-marketplace closed-deal medians. Full math + comparable deal list on /methodology.
How the multiple was built
| 📺 Ad-supported base | 15× MRR |
| ⭐ ★ rating ≥ 4.7 (premium) | +15% |
| 🏷 Business category multiple | +10% |
| ⭐ Mature user base (100K+ ratings) | +5% |
Final multiple
20× MRR
👥 Estimated audience size
8.0M
Lifetime downloads (US-equivalent)
Monthly active
1.7M
Daily active
510K
Synthetic estimate from ratings × category benchmarks. Calibrated against 2024-2026 mobile-attribution retention + DAU/MAU reports. Numbers are US-storefront-equivalent — true global audience can be 5-10× larger for international apps. Full math + source list on /methodology.
How we sized it
| 📲 Business engagement | ~65 installs / rating |
| 🔁 Business D30 retention | 22% |
| 📍 DAU / MAU stickiness | 0.30 |
DAU / MAU
30% sticky
🔬
How we forecast this revenue
MEDIUM CONFIDENCEBaseline
$1.4M/mo · ML-estimated from 234 triggers
Growth rate
+2.5% MoM · BIG tier baseline (compound monthly)
6 months
$1.4M – $1.9M
12 months
$1.5M – $2.3M
24 months
$1.8M – $3.3M
Compound growth at +2.5% MoM (tier baseline for BIG). Range widens with horizon — typical noise band ±15% at 6mo.. Ranges widen with horizon — distant futures carry more uncertainty.
📊
BU Investment Matrix
Concerning · 55/100BIG TIERbelow benchmarksGrowth Velocity
5.0
Founder Strength
5.3
Product Quality
9.7
Revenue Strength
6.1
Monetization Maturity
1.0
Defensibility
4.5
Market Position
2.0
Operational Safety
10.0
- 💰 Revenue: Healthy — $560K - $3080K/mo · BIG tier · medium-low confidence, trajectory unclear.
- ⭐ Quality: 4.87★ across 122,406 reviews — exceptional (top 1% in category).
- 📍 Market: Not yet charting in any of the 9 monitored markets.
- 📈 Growth: Insufficient signal to assess trajectory.
- ⚠️ Risk: Low — no material risk signals detected.
🎯 For competitors: Mixed picture. Worth competing if you have a clear UX or pricing edge — otherwise crowded segment.
💵 For acquirers: Estimated asking range 18-32× monthly = $25.2M-$44.8M.
Composite of 8 dimensions computed deterministically from public signals — no LLM, every score traces back to a measurable input. Default weights shown; "compete" / "acquire" / "invest" lenses re-weight without re-fetching.
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 15 of 15 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| High install base (122,406 ratings)METRIC | +$12,000 | |
| Paid app ($0.00)METRIC | +$2,800 | |
| Excellent rating (4.9★)METRIC | +$2,200 | |
| bugsREVIEW | −$1,800 | |
| 5 starREVIEW | +$1,800 | |
| great valueREVIEW | +$1,600 | |
| cancelledREVIEW | −$1,500 | |
| excellent appREVIEW | +$1,500 | |
| Mature app (12y old)METRIC | +$1,500 | |
| Multilingual (23 languages)METRIC | +$1,500 | |
| highly recommendREVIEW | +$1,400 | |
| slowREVIEW | −$1,200 | |
| too expensiveREVIEW | −$1,000 | |
| support teamREVIEW | +$900 | |
| priceyREVIEW | −$800 |
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.
🆕 What's New · v6.4.2
Welcome to the new Invoice Simple experience!
We've been working hard on improving our app's performance and stability while delivering the invoicing experience you expect with us.… Full release notes →
We've been working hard on improving our app's performance and stability while delivering the invoicing experience you expect with us.… Full release notes →
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- Invoice Simple: Rechnung
- Developer
- Zenvoice Inc.
- Bundle ID
- com.logicalengine.qsei
- App Store URL
- Open in App Store
- Category
- Business
- Content rating
- 4+
- Languages
- CS, DA, NL, EN, FI, FR, DE, HU, ID, IT, JA, KO, MS, NB, PL, PT, RU, ZH, SK, ES, SV, ZH, TR
Company
- Website
- Not found
- Tagline
- Create & Send Customer Invoices in Seconds
- Description
- Send professional invoices from your phone or laptop. The simplest invoicing software you'll ever use. Create your first free invoice today!
- Founded
- 2014
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- Available
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- $2.0MAI medium
- AI annual estimate
- $24.0M/yr
- ML model estimate / mo
- $22.4K/mo
- Top-grossing rank
- 🇬🇧#3 /100 🇫🇷#5 /100 🇦🇺#5 /100 🇨🇦#8 /100 🇺🇸#10 /100 🇩🇪#32 /100 🇮🇳#36 /100
- All-time revenue
- Not found
- Pricing
- Not found
Founder
- Name
- Not found
- X / Twitter
- twitter.com/InvoiceSimple
- linkedin.com/company/invoice-simple
- GitHub
- Not found
- X followers
- Not found
- Public statements
- Not found
Funding
Funding data not yet collected for this app.
Press & Links
Press & Links data not yet collected for this app.
Contacts & Socials
- Socials
- facebook facebook.com/InvoiceSimple · linkedin linkedin.com/company/invoice-simple · twitter twitter.com/InvoiceSimple · youtube youtu.be/sNJyvwA9rMM
- Not found
- Phone
- Not found
- Contact page
- invoicesimple.com/contact
- About page
- invoicesimple.com/about
✨AI Revenue EstimateCONFIDENCE: MEDIUM
The iOS app "Invoice Simple: Rechnung" by Zenvoice Inc. is estimated to generate approximately $2 million in monthly revenue, leading to an annual estimate of $24 million. This estimate is based on recent data from Sensor Tower for its performance in the US, United Kingdom, and Australia.
Sources mentioned: Sensor Tower, Growjo, Reddit, Wise, GetApp, PitchBook
📈Ratings growth122,496 ratings+22% lifetimeShow 3-year history estimate ▾
Tracked (52 weeks) Pre-tracking estimate (32 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Top Countries — Grossing Rank8 countries
🇬🇧GB#3 /100
🇫🇷FR#5 /100
🇦🇺AU#5 /100
🇨🇦CA#8 /100
🇺🇸US#10 /100
🇩🇪DE#32 /100
🇮🇳IN#36 /100
🇧🇷BR#79 /100
📊Category Rank Trajectory#3 now · best #3 · worst #48
Lower line = better rank · Estimate from ratings growth model · Lower position on chart = worse rank · Higher = top of chart
🚀Version Release Timeline3 releases tracked
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.
📝 About this app
Easily create & send professional invoices, estimates, and receipts on the go! The perfect tool for individuals and growing businesses that lets you quickly create a document on the spot while with your customer.
For growing businesses who want:
· A simple way to make estimates, invoices, and receipts fast
· Professional-looking invoices that you can send from your mobile device
· An easy way to accept online payments and stop chasing checks
From a landscaping invoice or estimate to a receipt for entertainment supplies in your side gig, Invoice Simple is the app for your small business.… View full description on the official store →
For growing businesses who want:
· A simple way to make estimates, invoices, and receipts fast
· Professional-looking invoices that you can send from your mobile device
· An easy way to accept online payments and stop chasing checks
From a landscaping invoice or estimate to a receipt for entertainment supplies in your side gig, Invoice Simple is the app for your small business.… View full description on the official store →
App Specs
🔐 Own this app? Claim & verify MRR →💾 201 MB🔞 4+📱 iOS 15.1+🔖 v6.4.2🔄 updated 0d ago🌐 CS, DA, NL, EN, FI +18📂 Business💰 Paid
📅
What Worked™ · Development Pipeline
7 EVENTS TRACKEDDetected changes in this app over its tracked lifetime — each event links cause (what changed) to effect (what moved). Sorted newest first.See full history →Version history →
2026-05
🔄
Monetization changed: paid → free
2026-03
📈
Crossed 500 ratings — social-proof flywheel kicking in
2026-03
⭐
Rating ↑ 3.60 → 4.75 (improved 1.15★)
2023-07
📈
Crossed 100 ratings — social-proof flywheel kicking in
2023-06
📈
Crossed 50 ratings — social-proof flywheel kicking in
2023-06
📈
Crossed 10 ratings — social-proof flywheel kicking in
2023-06
🚀
First tracked snapshot — initial data captured
🔎
ASO Keyword Positions
BEST RANK #2Ranked for 1 App Store search query in our last keyword sweep. Lower position = closer to the top.
invoicing·#2🇺🇸
Last sweep: 2026-05-19 · iTunes Search API
🌍
Multi-Country Performance
Available in 9 of 9 monitored markets| Market | Rating | Reviews | Current version |
|---|---|---|---|
| 🇦🇺 AU | 4.81276★ | 15,584 | 4.81276★ this version |
| 🇧🇷 BR | 4.87342★ | 1,343 | 4.87342★ this version |
| 🇨🇦 CA | 4.80332★ | 12,243 | 4.80332★ this version |
| 🇩🇪 DE | 4.75162★ | 1,236 | 4.75162★ this version |
| 🇫🇷 FR | 4.76331★ | 9,768 | 4.76331★ this version |
| 🇬🇧 GB | 4.83514★ | 29,324 | 4.83514★ this version |
| 🇮🇳 IN | 4.73304★ | 4,555 | 4.73304★ this version |
| 🇯🇵 JP | 4.69684★ | 729 | 4.69684★ this version |
| 🇺🇸 US | 4.86843★ | 122,479 | 4.86843★ this version |
🔔
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📝 Description
95
BU Score · Transcendent
Full revenue analysis
Read the article-style breakdown for Invoice Simple: Rechnung: category rank, percentile, growth signal, comparable apps, and how the forecast is calibrated against verified-MRR anchors in this niche.
Similar apps in Business
About this analysis
Why high confidence: 122,406 ratings · no founder-verified revenue (model estimate only).
❓ Frequently Asked Questions
4 answers · auto-generated from this app's public dataHow much does Invoice Simple make per month?▴
Based on our ML-calibrated revenue forecast, Invoice Simple earns approximately $22K/mo. This is a US-storefront-equivalent estimate; global revenue can be several times larger for internationally-distributed apps. See the methodology page for the full formula and confidence bands.
What apps are like Invoice Simple?▴
Browse the full Business category catalog to find similar apps with revenue, build cost, audience and tech stack data. Each /p/{slug} page also shows a Compare side-by-side widget with three peer apps from the same niche.
Who makes Invoice Simple?▴
Invoice Simple is published by Zenvoice Inc. on the Apple App Store. See the full publisher portfolio (other apps by the same developer) via the More by developer block on the product page above.
What is Invoice Simple's BU Score?▴
Invoice Simple has a BU Score of 84/100 (Excellent). The score combines App Store rating, ratings count, monetization model and revenue signals calibrated against founder-verified MRR anchors. See the BU Score formula.