Report updated Jun 3, 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 a specialized aquarium calculator app for iOS that provides volume, chemical dosing, and maintenance scheduling tools.
Users hire this app to ensure aquatic environment stability through precise chemical and volume math, reducing the risk of livestock loss due to calculation errors.
Current Momentum
v1.0 · 37mo ago
Zombie- No updates since April 2023 release.
- Zero feature additions in last year.
What makes this app unique?
What Does It Look Like?
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?
Toile d'Idée - Carte Mentale
Productivité
Darts Scoreboard Scorekeeper
Utilities
What do users think recently?
Analysis in progress, available soon
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for Fish Tank Buddy?
Where is it available?
Localized markets (1)
How's The Utilities Market?
Market outlook for this category
Available very soon
Which niche is Fish Tank Buddy in?
Explore the full Pets Calculators niche
Every app in this space — 2 tracked, the niche's live rankings, and Marlvel's editorial take on the job-to-be-done.
The rivals identified
Same space(4)
This app competes directly by providing a comprehensive digital ecosystem for aquarium management, moving beyond simple calculations into active maintenance tracking.
Differentiators
- Integrates an AI aquarium assistant to provide real-time guidance on water chemistry and livestock health
- Features automated maintenance reminders that ensure consistent tank upkeep compared to static calculation tools
- Includes robust water parameter logging capabilities that help users track long-term aquarium stability trends
While focused on pet hardware, it competes for the same 'niche hobbyist' utility market by offering specialized remote control and configuration tools.
Differentiators
- Provides hardware-specific remote control functionality that creates a deeper, more functional user dependency
- Offers granular stimulation intensity controls that demonstrate a more complex, technical interface than basic calculators
- Maintains a significantly larger user base, providing social proof and established trust in the utility category
This app overlaps by offering advanced automation and simulation features for aquarium enthusiasts who require more than just basic volume math.
Differentiators
- Supports direct aquarium equipment control, bridging the gap between digital software and physical tank hardware
- Includes an automated alarm system that alerts users to critical environmental changes in their aquatic setup
- Features fish and plant simulation tools that allow users to visualize ecosystem compatibility before purchasing
This app occupies the same 'specialized calculator' utility space, targeting users who rely on precise, data-driven tools for their specific hobbies.
Differentiators
- Optimized specifically for iOS performance, ensuring a smoother and more responsive user experience than generic calculators
- Provides highly specialized depth of field and exposure tools that cater to technical hobbyist requirements
- Demonstrates a clean, focused UI design that prioritizes rapid data entry over complex ecosystem management
New entrants(1)
This newcomer targets the high-end reef keeping segment with specialized monitoring tools that threaten to capture the more serious aquatic hobbyist.
Differentiators
- Offers advanced PAR level monitoring tools that are essential for high-end coral reef tank maintenance
- Provides specific livestock calculation logic tailored to the complex needs of saltwater reef environments
Compare Fish Tank Buddy against every rival
All rivals in one side-by-side table — identity, store metrics, ratings & sentiment, and strategic intel — plus a head-to-head page for each.
The outtake for Fish Tank Buddy
Strengths to defend, gaps to attack
Core Strengths
- Bicarbonate calculator provides a specialized chemical dosing tool for pH-sensitive aquatic environments.
Critical Frictions
- Zero updates since the initial release in April 2023.
- Single-review social proof limits new-user trust.
Growth Levers
- Integration of water parameter logging would capture long-term data trends currently missing from the toolset.
Market Threats
- Competitors with AI-assisted guidance and hardware-control features are rapidly capturing the serious hobbyist segment.
What are the next best moves?
Pivot development to add water parameter logging because competitors like Fish Tank Log use it to drive long-term retention → increase session frequency.
Competitor analysis shows that parameter logging is a key differentiator for market leaders.
Trade-off: Deprioritize the measurement converter UI refresh to focus engineering on data-logging architecture.
Maintain the existing calculator suite because it provides a baseline utility for beginners → defend the current user base from churn.
The core calculator features are the primary value proposition for the current user base.
Trade-off: No major lever displaced as this is a maintenance-level activity.
A counter-intuitive read
The app's lack of updates is not just a maintenance failure, but a strategic vulnerability that allows competitors to define the 'aquarium management' category through AI and hardware integration.
Feature Gaps vs Competitors
- Water parameter logging (available in Fish Tank Log but absent here)
- AI aquarium assistant (available in Fish Tank Log but absent here)
- Direct aquarium equipment control (available in FishCare but absent here)
Key Takeaways
Fish Tank Buddy provides a useful, focused utility for chemical dosing, but its lack of updates prevents it from competing with modern, data-driven aquarium management apps, so the PM should prioritize adding parameter logging to remain relevant.
Where Is It Heading?
Declining
The aquarium utility market is consolidating around apps that offer integrated hardware control and AI-driven guidance. Fish Tank Buddy remains in a static state, which will lead to a loss of relevance as users migrate to tools that provide more comprehensive ecosystem management.
The lack of updates since April 2023 signals a maintenance-mode posture, which prevents the app from competing with rivals that add features quarterly.
Competitor activity in the aquarium utility space is accelerating, with rivals adding AI and hardware control, which will erode Fish Tank Buddy's market share.