By harry bloch
Report updated May 12, 2026
Fish Tank Buddy
For aquarium hobbyists ranging from beginners to experienced fish keepers requiring precise chemical and volume calculations.
Fish Tank Buddy is an established utilities app that is completely free. With a 5.0/5 rating from 1 reviews, it shows polarized user reception.
What is Fish Tank Buddy?
Fish Tank Buddy is an aquarium utility app for iOS that provides volume, chemical, and maintenance calculations for fish keepers.
Users hire this app to ensure precise chemical and water balance in their tanks, reducing the risk of ecosystem failure.
Current Momentum
v1.0 · 37mo ago
Zombie- Initial release April 2023.
Active Nemesis
Fragmented niche
No dominant direct rival identified yet — see Other Rivals below.
Other Rivals
Rating Pulse 🇺🇸
What makes this app unique?
What Does It Look Like?
How Is The App's Momentum Right Now?
Loading...
What Are The Key Features?
Calculates required water and substrate volumes based on user-input tank dimensions.
Determines specific bicarbonate dosage to maintain target pH levels in aquatic environments.
Switches between metric and imperial units for tank dimensions and chemical dosing.
Sends push notifications for scheduled fish feeding, tank cleaning, and water level checks.
How much does it cost?
- Free
The app is currently offered as a free utility with no visible in-app purchases or subscription tiers.
Who Built It?
Enrichment in progress
Publisher profile available very soon
What other apps does harry bloch make?
What do users think recently?
Analysis in progress, available soon
What is the competitive landscape for Fish Tank Buddy?
How's The Utilities Market?
Market outlook for this category
Available very soon
The rivals identified
Peers
Includes advanced aquarium equipment control features that allow for remote management of tank hardware components.
Provides fish and plant simulation tools that help users visualize potential ecosystem outcomes before implementation.
Offers direct hardware integration for smart bark collars, creating a high-barrier ecosystem for pet owners.
Provides granular stimulation intensity controls that cater to users requiring precise, device-specific configuration settings.
Integrates AI-driven aquarium assistance to provide proactive health recommendations for fish and aquatic plants.
Features robust multi-tank management capabilities that allow users to track water parameters across several setups.
Mango Exposure: The Calculator
★5.0 (1)Mango Umbrella LLC
This app occupies the same 'niche calculator' utility space, competing for the attention of users seeking specialized, dimension-based calculation tools.
Optimized specifically for iOS performance, providing a highly responsive interface for complex photographic exposure calculations.
Focuses on professional-grade depth of field tools that serve as a benchmark for high-utility calculator design.
The outtake for Fish Tank Buddy
Strengths to defend, gaps to attack
Core Strengths
- Bicarbonate calculator provides a specific chemical dosing utility missing in generic tools.
Critical Frictions
- Zero monetization model limits development resources.
- Lack of multi-tank tracking prevents long-term user retention.
Growth Levers
- Integrate AI-driven health diagnostics to compete with Fish Tank Log.
- Add premium subscription for advanced chemical logging.
Market Threats
- Fish Tank Log’s proactive health recommendations drain the user base as hobbyists seek more than static calculations.
What are the next best moves?
Implement multi-tank tracking because it is the primary retention gap against Fish Tank Log → increase user lifetime value.
Competitor analysis identifies Fish Tank Log as the primary threat due to its multi-tank tracking capabilities.
Trade-off: Pause the development of new conversion calculators — tracking features have higher retention impact.
Introduce a premium subscription tier because the current free-only model lacks sustainability → fund future feature development.
The current free-only model provides no clear path to monetization or resource growth.
Trade-off: Deprioritize UI polish sprints — revenue sustainability is the immediate survival requirement.
A counter-intuitive read
The app's simplicity is its greatest liability, as the utility-calculator market is being rapidly consolidated by apps that offer proactive ecosystem health monitoring.
Feature Gaps vs Competitors
- AI-driven health recommendations (available in Fish Tank Log)
- Multi-tank management (available in Fish Tank Log)
- Hardware-integrated remote management (available in FishCare)
Key Takeaways
Fish Tank Buddy succeeds as a simple utility but fails to retain users as they scale their hobby, so the PM must prioritize multi-tank tracking and monetization to prevent churn to comprehensive competitors.
Where Is It Heading?
Stable
The aquarium utility market is shifting toward integrated ecosystem management, leaving static calculators like Fish Tank Buddy exposed to churn. If the app does not evolve into a tracking platform, it will lose its user base to competitors that offer proactive health monitoring.
Lack of feature updates since the initial release suggests the app is in maintenance mode, which invites disruption from active competitors.