Stackis RPN vs Check Split and Tip Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stackis RPN
A calculator designed for users who prefer Reverse Polish Notation (RPN). It offers a familiar interface for RPN users and includes support for duodecimal calculations.
- RPN calculation style
- Duodecimal (dozenal) support
- Familiar interface for RPN users
- Simple and pleasant user experience
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This is an RPN calculator in the style of, for instance, old HP models. It will feel familiar if you are used to RPN, otherwise it will probably be a little confusing at first. It's not programmable and it doesn't try to mimic older hardware; it's just meant to be a pleasant calculator for those who prefer to use RPN. Also, if you want to perform calculations in duodecimal (dozenal), this app is for you!
Check Split and Tip Calculator
Effortlessly divide bills and calculate tips for group outings. Send payment requests instantly via popular apps. Customize settings for a personalized experience.
- Fast bill splitting
- Automatic tax calculation
- Quick tip buttons
- Split 2-99 ways
- Send payment requests
- Works offline
- Privacy focused
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Split the check in three taps, right at the table. No math, no account, no awkward silence. HOW IT WORKS 1. Enter the bill 2. Pick a tip 3. Tap how many people Everyone's share appears big enough to read across the table. Tap Request and Venmo opens with the amount and note filled in. WHO HAD WHAT Switch to "By item" and add each dish and drink, or scan the receipt and let the app find them. Tap names to show who had what; tax and tip are split in proportion. No more "I only had a salad." GET PAID BACK • Venmo: opens a request with the amount and note filled in • Text the split: send everyone the breakdown in one message • PayPal, Cash App and Zelle (Pro): friends get a tap-to-pay link, or your Zelle details, with their share filled in SMART DEFAULTS • Set your sales tax once; tip before or after tax • Tip buttons you choose, plus any custom percentage • Split 2–99 ways in 11 currencies • History of every split you send TRY PRO FREE Your first 3 bills include everything in Pro. After that, Pro is a single purchase: • Receipt scanning • Unlimited items per bill (Free includes 5) • PayPal, Cash App and Zelle pay links • Round each share up to an easy number • Full split history and CSV export (Free shows the last 10) • Extra tip profiles like "Date night" or "Work lunch" Pay once, keep it forever. No subscription, no ads. PRIVATE AND OFFLINE Everything is calculated on your phone, and receipts are read on your phone too: the photo is never uploaded. Works in basement bars and dead zones. No sign-up, no tracking. Privacy Policy: https://splitsecondpay.com/privacy-policy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Stackis RPN at every 4 days against Check Split and Tip Calculator's every 3 weeks. On price, rating, review sentiment and ratings volume 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. Stackis RPN sells 1 one-off in-app purchase and Check Split and Tip Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for Stackis RPN against 5.0 for Check Split and Tip Calculator. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Stackis RPN ships an update every 4 days, Check Split and Tip Calculator every 3 weeks. Both last shipped on November 5, 2026.
| Parameter | Stackis RPN | Check Split and Tip Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (4 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 2 | 4 — better |
| Update frequency | Every 4 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Skimra | Raymond Rothwell |
Customer experience
Stackis RPN
Check Split and Tip Calculator
In-app purchases
Stackis RPN
- Advanced Mode$1.99
Check Split and Tip Calculator
- SplitSecond Pay Pro$2.99
Questions
Is Stackis RPN free?
Is Check Split and Tip Calculator free?
Which has better reviews, Stackis RPN or Check Split and Tip Calculator?
Do Stackis RPN or Check Split and Tip Calculator have ads?
Which is updated more often, Stackis RPN or Check Split and Tip Calculator?
Other comparisons
