Chemical Engineering Formulate vs AI Hub
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Chemical Engineering Formulate
This comprehensive reference tool provides over 1,500 formulas, calculators, and conversion charts for chemical engineering professionals and students. It covers a wide range of topics including heat transfer, fluid mechanics, and reaction kinetics, with support for both US and Metric units.
- 1,500+ formulas and calculators
- 700+ engineering calculators
- US/Metric unit toggle
- Dual-unit display
- Searchable reference tables
- Offline functionality
- Save and share calculations
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CHEMICAL ENGINEER is the essential tool for Chemical Engineers, Process Engineers, and engineering students. With over 1,500 formulas and calculators, this is the most comprehensive chemical engineering reference app available. The app features 700+ engineering calculators across 50 categories, 750 conversion formulas, 8 temperature scales, and 14 reference tables. All formulas support US and Metric (SI) units with one-tap toggle and dual-unit display. CORE CHEMICAL ENGINEERING - Heat Transfer -- LMTD, overall heat transfer, fin efficiency, radiation, Fourier's law - Fluid Mechanics -- Reynolds number, Bernoulli, Darcy-Weisbach, Hagen-Poiseuille - Thermodynamics -- Ideal gas, Clausius-Clapeyron, Antoine equation, compressibility - Reaction Kinetics -- Arrhenius equation, rate laws, CSTR/PFR design, Levenspiel - Mass Transfer -- Fick's law, mass transfer coefficients, wetted wall columns - Distillation -- McCabe-Thiele, Fenske, Underwood, relative volatility - Dimensionless Numbers -- Reynolds, Nusselt, Prandtl, Schmidt, Sherwood, Grashof UNIT OPERATIONS Filtration, Packed/Fluidized Beds, Compressor Sizing, Mixing, Cooling Towers, Membrane Separation, Crystallization, Liquid-Liquid Extraction, Adsorption PROCESS & SAFETY Process Economics, Process Control, Safety Engineering, Corrosion and Electrochemistry ENVIRONMENTAL Air Quality, River/Lake/Soil Pollution, Infiltration and Recharge, Evaporation, Waste ADDITIONAL CATEGORIES Piping (70), Pressure Stress (109), Material Weight (101), Area Formulas (60), Flat Plates, Pumps, Pump Laws, Steam, Crusher, Vapor Separators, Equilibrium, Cogeneration, and more CONVERSIONS BTU, Cubic, Flows, Ft-Lbs, Horsepower, HVAC, Hydraulic, Linear, Liquid, Metric (460), Power, Pressures, Square Measures, Watts, Weights TEMPERATURE SCALES Celsius, Fahrenheit, Kelvin, Rankine, Reaumur, Newton, Delisle, Romer 14 REFERENCE TABLES Chemical Properties, Steam Tables, Pipe Schedules, Material Densities, pH Scale, Engineering Constants, Chemical Resistance, Water Quality, Critical Properties, Antoine Constants, Heat Transfer Coefficients, Dimensionless Numbers, Gas Properties, Flammability Limits FEATURES - US/Metric toggle with dual-unit display - Save calculations and favorites - Share and export results - Searchable reference tables - Dark mode interface - Works offline Don't see a formula you need? Email us and we'll include it in the next update.
AI Hub
Access a wide range of powerful AI models for chat, image, video, and agent generation. This app offers affordable access to multiple leading open-source and commercial LLMs, optimizing performance and providing low-latency responses globally. It includes a free tier and a comprehensive PRO plan for unlimited access.
- Access 50+ open-source and commercial AI models
- AI chatbot with vision and document support
- AI video generation from images or text
- AI agent programming for workload optimization
- AI image generation from text prompts
- AI Text-To-Speech with .wav export
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App support these models but not limited: • Grok-4.7 by x.Ai • Google Gemini 3.8 & Gemma 4 • OpenAI chatGPT 6.1 & opensource OSS • Claude Sonnet 5.5 by Anthropic • Qwen (Alibaba) with multi variant: QwQ reasoning, QvQ, Qwen Max... • Stable Diffusion, Seedream, Imagen 4, Leonardo.AI • Flux.1 AI, Photon AI • Mistral AI multi variants • DeepSeek v4.1 and v4 Pro • Meta Llama 4 newest & Llama 3.3 • Xiaomi Mimo V2 • GLM by Z.Ai • Nemotron by NVIDIA 【AI Deep Research】 + Automatically gather, cross-reference, and synthesize information from multiple sources. + Perfect for students, researchers, analysts, and professionals who need thorough, reliable answers beyond simple Q&A. 【 AI Scheduled Task】 + Schedule AI tasks to run automatically at your preferred time — daily, weekly, or custom intervals. + Ideal for automating repetitive research, morning briefings, news, competitor monitoring, and more. 【AI chatbot support】 + Vision (Photo) + Document, Pdf attachment. + Custom instruction (Advanced users) + Custom temperature (Advanced users) 【AI Video generation】 + Effortless transform your static image to video + Create a video from text prompt. 【AI agent programming】 + Effortless build your own standalone agent. Optimize your workload by forcing the structure response with AI 【AI image generation】 + Generating images by prompt text with many different models 【AI Text-To-Speech support】 + Generating voices from your text, export to file .wav. 【Affordable AI Access】 We offer significant savings compared to single-model apps, providing access to multiple models in a single app. Instead of overpaying for individual models, you have a chance to access all in one app. Would help savings up to 60%. 【What sets us apart?】 We’re a platform that fine-tunes and optimizes leading open-source AI models, ensuring top performance. Our data centers are strategically distributed across continents, guaranteeing low-latency responses no matter where you are. In addition, we are a distributor of re-distributing AI models api from the providers such as: Google Gemini, Stability AI, Anthropic Claude, Meta Llama, and more. Our strong dealer-ships allow us to provide you with the best prices in the market. ScreenReader (VoiceOver) is compatible with AI Hub. A lot of efforts to make AI accessible widely, without borders. App comes with 2 Plans: • BASE Plan / Always-Free Tier: Perfect for daily tasks. At least, 3 AI models are accessible. Tight rate-limited request. Especially, no-ads, no account required, no prepaid. • PRO Plan: Unlock unlimited access to all available models. Generous rate-limited or advance AI custom. We Offers PRO plan with: • Weekly, monthly and annually subscription. • Life-time purchase. Premium credit purchase. Specially, Annual subscription starts with Free-trial starting at zero buck. Terms of Purchase: https://policies.aihubapp.io/inapppurchase/ Terms of Use: https://policies.aihubapp.io/tou/
Screenshots
Verdict
The clearest difference is review sentiment: AI Hub at 64% against Chemical Engineering Formulate's 0%. AI Hub also leads on price (Free vs $4.99) and update cadence (monthly vs every 8 months). On ads, in-app purchases and device support 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
AI Hub is free to download; Chemical Engineering Formulate costs $4.99 up front. Chemical Engineering Formulate sells 1 one-off in-app purchase and AI Hub sells 8 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Chemical Engineering Formulate ships an update every 8 months, AI Hub monthly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | Chemical Engineering Formulate | AI Hub |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | — | 4.2 (61 ratings) — better |
| Positive reviews | 0.0% of reviews | 64.1% of reviews — better |
| Number of ratings | — | 61 — better |
| Update frequency | Every 8 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 19 MB | 66 MB |
| Age rating | 4+ | 12+ |
| Developer | Historycentral.com | TRIPICAL VIET NAM LIMITED LIABILITY COMPANY |
Customer experience
Chemical Engineering Formulate
AI Hub
Bugs and requests
Chemical Engineering Formulate
Not enough reviews yet to summarise bugs or requests.
AI Hub
Reported bugs
10 issues- Models disappear after updates
- Input size drastically reduced
- Long HTML analyses are blocked
- Claude, GPT 4.1, Gemini 2.5 Pro, etc. not working due to input size limits
- Images not generated or visible
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- App crashes
- Paid plan not functioning
- Keyboard issues affecting readability
- 30 prompt limit across all platforms in 30 minutes
- App exits unexpectedly
Requested features
8 requests- Add a dedicated button/toggle for language translation on the start page
- Automatic detection and faster language switching
- Quick access language list
- Ability to download larger PDF files
- Desktop or web-based version
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- Area for custom model instructions
- Save/export content option
- Desktop Mac OS application
In-app purchases
Chemical Engineering Formulate
- Chemistry Pro$3.99
AI Hub
- Weekly Subscription$3.997 Days
- Monthly Subscription$6.491 Month
- Yearly Subscription3 Days trial$69.991 Year
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- Yearly Subscription3 Days trial$79.991 Year
- 25000 Prepaid credits$12.99
- 3 months PRO | Non-renewal$24.99
- Lifetime | One-time purchase2 variants$149.99
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- Lifetime | PRO plan$149.99
Questions
Is Chemical Engineering Formulate free?
Is AI Hub free?
Do Chemical Engineering Formulate or AI Hub have ads?
Which is updated more often, Chemical Engineering Formulate or AI Hub?
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