CalcFast is a simple calculator for iOS and watchOS that includes a calculation history tape and system-level extensions.
Product velocity
Maintenance
Daily rank 🇺🇸
—
Utilities
Sentiment
4.2
20 reviews
Nemesis
Calculator +
The App DNA
What makes this app unique?
Users hire CalcFast for quick, low-friction arithmetic where the ability to review past inputs is essential for accuracy.
For iOS and watchOS users seeking a simple, history-enabled calculator that integrates with system-level productivity features.
What does it look like?
Key features
Scrollable record of past inputs and results, serving as a retention loop for financial tracking.
Calculator interface within the iOS Today View, acting as a distribution barrier.
Standalone calculator for quick wrist-based interactions.
How much does it cost?
The app is distributed as a free utility with no visible subscription or IAP gates.
Velocity
Maintenance developmentperformanceShow more...
With only one release recorded in the observed data, the app is currently operating at a maintenance cadence. The latest release occurred on April 23, 2026, approximately 3 weeks prior to the current date. There is insufficient data to establish a trend of acceleration or deceleration. Development appears focused on core engine stability rather than frequent feature updates or live operations.
Who built it?
Hannes Sverrisson
6 apps tracked · Utilities
Calculator Silver
Orðabók
Bensin
Wordlito
CalculateRetroUser Sentiment
What do users think recently?
The recent review mood reads excited. Users appreciate calculation tape feature provides a clear record for tracking and tallying complex commission amounts.
How are ratings & reviews evolving?
What users say, by theme
- Calculation tape feature provides a clear record for tracking and tallying complex commission amounts
- Calculation history disappears following updates, causing frustration for users relying on saved data
16 of 16 recent reviews analyzed · moderate confidence · Excited overall
Read the full review analysisCompetition
Competitive landscape for CalcFast
How's the Utilities market?
CalcFast maintains a 4.2-star rating across 20 reviews, positioning itself as a lightweight utility in a market dominated by feature-heavy rivals.
Read the market outlookThe rivals identified
By xNeat.com
This app is the primary nemesis due to its massive install base and comprehensive feature set that spans beyond basic arithmetic into scientific and graphing capabilities.
- Offers advanced graphing and scientific solvers which are entirely absent from CalcFast's basic utility focus
- Maintains a massive, established user base that creates a significant barrier to entry for competitors
Time Duration CalculatorContender
Dash Calc: Simple Fast MathContender
Ratio & Text CalculatorContender
Fluid Mechanics CalculatorContenderUnlock the head-to-head verdict: where this rival wins, and where it loses.
Access the full report for freeThe Analyst's Read
Key takeaways for CalcFast
Where is it heading?
The utility calculator market is consolidating around tools that offer either extreme simplicity or advanced scientific solvers. CalcFast's maintenance-mode posture leaves it exposed to both ends of this spectrum, so the PM must stabilize the core data experience to prevent further user migration to more robust alternatives.
- Calculation history loss following updates erodes user trust, which compounds the churn risk against feature-rich competitors.
- Recent updates focused on stability and engine improvements, with no new feature expansion to drive growth.
The SWOT
- System-level integration via Today Extension provides a distribution barrier into daily-use habits
- Focused UX creates a low-friction entry point for users overwhelmed by scientific calculators
- Adding specialized calculation modes could capture users currently migrating to Dash Calc
- Implementing cloud-based history storage would resolve the top-reported frustration regarding data loss
Next best moves
Ship cloud-based history persistence because data loss after updates is the top-reported frustration → reduce churn risk
+ 1 more prioritized moveThe counter-intuitive read
The app's lack of monetization is a strategic vulnerability…
Read the full takeFeature gaps
Scientific and graphing capabilities (available in Calculator + but missing here) +1
Since the last report: The product roadmap has pivoted to prioritize cloud-based history persistence to mitigate churn, while competitive analysis now highlights a vulnerability to real-time calculation tools.
Bottom line
CalcFast retains a loyal base through its simple, history-enabled interface, but the recurring loss of saved data after updates threatens long-term retention, so the PM should prioritize a robust data-persistence layer to stabilize the user base against feature-rich competitors.
Unlock 2 critical frictions, 2 market threats, 1 more prioritized move and the analyst’s take.
Access the full report for freeFAQ
Is CalcFast free to use?
Does CalcFast work on Apple Watch?
How does CalcFast compare to Calculator +?
Is my calculation history saved?
Sources
- [1] App Store, source
Report last updated