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84
BU Score
Excellent

Invoice Simple: Rechnung

4.9 ✍️ Editor
✍️ BU Analytics Review

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.

Our BU Score puts it at 84Excellent (strong product-market fit). For a Business app, that means strong product-market fit.

Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.

creator

📊 Performance Tracking LIVE

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idle
0%
Rating
Reviews
Forecast Revenue / mo
Snapshots tracked
0
since first record
Range:

💰 Forecast Revenue / mo

MODEL
Revenue 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

LIVE
Cumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jun 25
Jul 25
Aug 25
Sep 25
Oct 25
Nov 25
Dec 25
Jan 26
Feb 26
Mar 26
Apr 26
May 26

⭐ Rating Trend

LIVE
Average rating evolution. Updates with each new review batch.

🗓️ Snapshot Timeline

HISTORY
Each bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →
💾 199 MB🔞 4+📱 iOS 15.1+🔖 v6.2.0🔄 updated 1w ago🌐 CS, DA, NL, EN, FI +18📂 Business💰 Paid🚀 Launched 2013 (12y old)

📝 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.

START YOUR FREE TRIAL


6 WAYS INVOICE SIMPLE MAKES YOUR LIFE AS A BUSINESS OWNER EASIER

1. SIMPLE TO USE
Designed to make sure you never have to waste time “figuring out” how to make it work.

2. INVOICE ANYWHERE
Standing next to your client, in your truck, or sitting at your desk, there’s no quicker way to send an invoice.


3. GET ORGANIZED
Keeping track is effortless. Your entire history is collected in one place, easy to find and read. Taxes are a breeze.


4. LOOK MORE PROFESSIONAL
Create professional-looking invoices and estimates on the spot.


5. GET PAID FASTER
Making it easy to get paid by accepting cards with simple fee structure and low rates that you can add to an invoice - no cost to you, as well as accept checks and cash.

6. INVOICE WITH CONFIDENCE
Join hundreds of thousands of small businesses who rely on Invoice Simple, consistently a top-rated invoicing app.


Easily customize every aspect of your invoice, estimate, or receipt:

1. Add your logo and business details
2. Include your banking details
3. Easy-add and import client details saved in your phone contacts
4. Customize tax and add discounts
5. Accept credit card payment with simple fee structure and low rates that you can add to an invoice - no cost to you, as well as accept checks and cash
6. Add product information and attach photos
7. Include your signature


Send your invoice or estimate by email, text, WhatsApp, or download it as a PDF. Get instant alerts when it's opened, paid, or is overdue with instant mobile device and email notifications.

You don’t have to limit yourself to cash and checks. Just select “accept online payments” and follow the simple steps to hook up your invoices to Invoice Simple Payments.


PLANS:


Start with a free trial, then choose the best plan for your business:


Essentials
For entrepreneurs to easily start sending estimates, invoices, receipts, and receive payments.

· Up to 3 invoices per month

· QR code payments

· Online payments

· Real time read receipts

· Expense tracking

· Top rated mobile and web apps


Plus
For small businesses to send nice-looking, easy to create documents on-the-go.

Everything in Essentials, plus:

· Up to 10 invoices per month

· Add photos

· Business owner signature

· Autofill client & item info

· Due date reminders


Premium
For small businesses to improve invoice organization and make online payments easy.

Everything in Plus, along with:

· UNLIMITED invoices per month

· Customer support 1st response priority


Invoice Simple, the ultimate invoice, receipt, & estimate maker: Send simple invoices using professional templates, invoice generator, PDF invoices and quotes, online payments, bill organizer, receipt and expense tracking, and business reporting—all rolled up into one easy-to-use app. When it's time to create an estimate, invoice, or receipt for your small business, Invoice Simple will work for you.


Terms of use: https://www.invoicesimple.com/terms

Privacy policy: https://www.invoicesimple.com/privacy

🆕 What's New · v6.2.0

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.

Let us know what you think and feel free to contact our 24/7 support team if you come across any issues

- various bug fixes

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
OG image

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   🇫🇷#4 /100   🇦🇺#5 /100   🇨🇦#7 /100   🇺🇸#9 /100   🇮🇳#33 /100   🇩🇪#35 /100
All-time revenue
Not found
Pricing
Not found

Founder

Name
Not found
X / Twitter
https://twitter.com/InvoiceSimple
LinkedIn
https://www.linkedin.com/company/invoice-simple
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
https://www.invoicesimple.com/blog/
Press / News
Not found

Contacts & Socials

Socials
facebook · linkedin · twitter · youtube
Email
Not found
Phone
Not found
Contact page
https://www.invoicesimple.com/contact/
About page
https://www.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
Citations: sensortower.com
Recent App Store Reviews49 latest · avg 1.98★ · 18.4% 5★ · 65.3% 1★
5★
9 (18%)
4★
1 (2%)
3★
2 (4%)
2★
5 (10%)
1★
32 (65%)
+97 ratings/week
Praise: great ×10 recommend ×5 love ×4 best ×1Complaints: subscription ×10 expensive ×4 worst ×3 scam ×2 refund ×2
Top positive
★★★★★ Professional and easy
This app makes creating invoices and submitting them and tracking your finances just plain stupid easy. Everything looks as professional as you could ever want and it just makes it easy. Zenvoice nailed it!…
★★★★★ Simple to use and quick
Great program…
Top negative
★☆☆☆☆ The new upgrade system is fatally words
I was happy with this app, but after using the app more often the system decided to selling me the upgrade plan with out choice,the team can evenly leave me with the plus plan i have before they say the system is set up to collect more mone…
★☆☆☆☆ Keeps saying I have 0 invoices left
This used to be a great app until they did something in the backend because now I constantly keep getting a message that I have 0 invoices left when I pay monthly for unlimited. Keep in mind I pay for 2 accounts because I have 2 shops and e…
📈Ratings growth122,419 ratings+19% lifetimeShow 3-year history estimate ▾May 2023Sep 2025May 2026
Tracked (52 weeks) Pre-tracking estimate (32 weeks) · model-based, ±5% noise · anchored to release date and current value
🗺️Geographic DistributionTop 10Top 30Top 60
GB#3FR#4AU#5CA#7US#9IN#33DE#35BR#77
🌍Top Countries — Grossing Rank8 countries
🇬🇧GB
#3 /100
🇫🇷FR
#4 /100
🇦🇺AU
#5 /100
🇨🇦CA
#7 /100
🇺🇸US
#9 /100
🇮🇳IN
#33 /100
🇩🇪DE
#35 /100
🇧🇷BR
#77 /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
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.
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