Comparison

Sifter vs Freestyle Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sifter

This app provides a smart spam filter for iOS devices, allowing users to create personalized rules to block unwanted text messages. It prioritizes user privacy with local processing and offers advanced filtering options like regular expressions.

Highlights
  • Customizable filtering rules
  • Blacklist and whitelist contacts
  • Regex filtering for advanced control
  • Local data processing for privacy
  • Blocks unwanted SMS and MMS
Currently charting
Read full description

Reclaim your inbox with Sifter, the intelligent and private SMS filter for iOS. Powered by a robust Message Filter extension and secure on-device processing, Sifter gives you absolute control over your messaging experience without compromising your privacy. FOCUS ON WHAT MATTERS Sifter empowers you to design personalized filtering rules to block unwanted texts while keeping your inbox clean and focused. With a refined interface built for speed and clarity, managing your rules is seamless and efficient. KEY FEATURES - RULE-BASED CATEGORIZATION: Easily filter and organize messages into Transactions and Promotions using your own custom rules. - GRANULAR FILTERING: Tailor your protection with specific rules. From simple keywords to sophisticated patterns, you decide exactly what reaches your notification center. - CONTACT MANAGEMENT: Protect your peace of mind by whitelisting trusted contacts or blacklisting specific numbers and entire contact lists. - ADVANCED REGEX ENGINE: Leverage the power of Regular Expressions to create intricate, high-precision filtering rules for complex messaging patterns. - PRIVACY-FIRST ARCHITECTURE: Sifter operates entirely locally on your device. Your messages never leave your phone, ensuring your personal data remains 100% private. SUPPORTED RULE TYPES - Whitelist and Blacklist Users (Contacts/Numbers) - Whitelist and Blacklist Keywords - Transactional and Promotional Categorization - Regex-powered versions of all the above Sifter is your personal gatekeeper. Whether you are blocking marketing noise or organizing important transactional alerts, Sifter provides a private and powerful solution to keep your messaging focused on what truly matters. Download Sifter and take full control over your inbox.

About

Freestyle Calculator

This app offers real-time expression editing with instant results as you type, eliminating the need for an equals button. It features a searchable history, unit conversions, and customizable keyboard layouts and themes for a personalized calculation experience.

Highlights
  • Real-time expression preview
  • Live editing with cursor repositioning
  • Searchable, annotated calculation history
  • Unit conversions for various metrics
  • Customizable keyboard layouts and themes
  • Cloud sync for backup and restore
Features
Read full description

Freestyle Calculator gives you real-time expression editing on iPhone and iPad. Start typing and watch the result update live — no equals button needed. Move the cursor anywhere in your expression, edit freely, and the preview adjusts instantly. Every calculation is saved with a searchable, annotated history. CORE FEATURES ▸ Real-time preview — see results as you type ▸ Expression editing — backspace, insert, or reposition the cursor ▸ Searchable history — pin, copy, annotate, or reuse any calculation ▸ Unit conversion — length, mass, area, volume, temperature, time ▸ Reference exchange rates — multiple providers with automatic fallback ▸ Widgets — exchange rates and formulas on your home and lock screen PRO FEATURES ▸ Keyboard Studio — rearrange keys, save multiple layouts (Compact / Standard / Scientific) ▸ Theme Studio — 10 keyboard themes, accent colors, key density, dark mode ▸ Custom Formulas — reusable workflows with variables and live FX rates ▸ Sessions — organize work into named groups with notes and pins ▸ Cloud Sync — back up everything to iCloud, restore on any device Always available: real-time preview, full history, unit conversion, and scientific keys. No ads, no accounts, no server dependency. Your data stays on your device by default. Privacy Policy: https://apps.foamzou.com/freestyle-calculator/privacy/ Terms of Use: https://apps.foamzou.com/freestyle-calculator/terms/

Screenshots

Sifter4 screens
Freestyle Calculator4 screens

Verdict

The call

The clearest difference is review sentiment: Freestyle Calculator at 100% against Sifter's 29%. Freestyle Calculator also leads on price (Free vs $2.99) and rating (5.0 vs 4.1). Sifter's advantage is in-app purchases (none vs 6) and ratings volume (116 vs 8). On ads, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Freestyle Calculator is free to download; Sifter costs $2.99 up front. Freestyle Calculator sells 6 in-app purchases, starting at $0.99 per month. Sifter asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Freestyle Calculator holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Sifter has 116 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 29% of Sifter's written reviews are positive against 100% of Freestyle Calculator's.

UpkeepUpdate frequency

Sifter ships an update every 3 months, Freestyle Calculator weekly. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

Scorecard8 real differences · 3 level
Sifter versus Freestyle Calculator: the parameters behind the verdict, then further details
ParameterSifterFreestyle Calculator
Price$2.99Free — better
Rating4.1 (116 ratings)5.0 (8 ratings) — better
Positive reviews28.6% of reviews100.0% of reviews — better
Number of ratings116 — better8
Update frequencyEvery 3 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
Best chart rank#183 — better—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.016.0 — better
Further details — not scored
Size10 MB27 MB
Age rating4+4+
Developer磊 汪锋 邹

Customer experience

Sifter

All ratings112 ratings
Positive76.8%
Neutral1.8%
Negative21.4%
Written reviews14 reviews
Positive28.6%
Neutral7.1%
Negative64.3%

Freestyle Calculator

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sifter

No in-app purchases

6 purchases

Freestyle Calculator

Subscriptions2
  • CalcStudio Pro Monthly$0.991 Month
  • CalcStudio Pro Annual7 Days trial$3.991 Year
One-time4
  • Small Tip$0.99
  • Medium Tip$3.99
  • CalcStudio Pro Lifetime$7.99
Show 1 more
  • Large Tip$9.99

Questions

Is Sifter free?
Sifter costs $2.99, with no in-app purchases.
Is Freestyle Calculator free?
Freestyle Calculator is free to download, with in-app purchases available.
Which has better reviews, Sifter or Freestyle Calculator?
Freestyle Calculator is rated higher. Sifter averages 4.1 out of 5 from 116 ratings, while Freestyle Calculator averages 5.0 from 8 ratings.
Do Sifter or Freestyle Calculator have ads?
Neither Sifter nor Freestyle Calculator shows ads.
Which is updated more often, Sifter or Freestyle Calculator?
Sifter ships an update every 3 months, and Freestyle Calculator weekly. Most recently, Sifter was updated on November 6, 2026 and Freestyle Calculator on November 5, 2026.

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