v1.0 Now Available

Decisions, not
just percentages.

Stop guessing your mana base. Paste your decklist and OnCurve tells you exactly which sources you're missing to cast your spells on time.

Analyze Decklist
CONSISTENCY GRADE
B+
Risk: Early Red Source
Deck Analysis
Izzet Murktide
Midrange
Modern
T1
14 Sources
7 Sources
T2
15 Sources
9 Sources
T3
15 Sources
9 Sources
Requirement: 14 Untapped Blue Sources (T1) Sufficient
Lightning Bolt
Turn 1: Missing 3 Sources

Trusted by grinders from

PRO TOUR
ONLINE
ARENA
RCQ

Stop counting lands.
Start counting sources.

OnCurve distinguishes between a tapped land and an untapped source. It knows that a Turn 1 Fetchland is a red source, but a Turn 1 Slowland is a dead card.

Source Timing Engine

Calculates exactly when a land becomes usable.

Deficit Detection

Identifies missing colors for specific turns.

Turn 1 Analysis
CRITICAL
Mountain
Basic Land
Untapped
Arid Mesa
Fetchland
Untapped (Paid)
Stormcarved Coast
Slowland
Tapped

Optimization Engine

Cut the fluff. Fix the curve.

Smart Recommendations

Actionable changes,
not just data.

We don't leave you to interpret the math. OnCurve suggests specific land swaps based on your deck's speed and color requirements.

Cut Suggestions

Identify lands that are too slow or over-represented.

Add Recommendations

Suggestions for Fastlands, Shocks, or basics based on needs.

Recommended Fix
Improve Early Red
+15% Consistency
Cut 2x Sulfur Falls
Too slow for Turn 1 Bolt
Add 2x Spirebluff Canal
Unlocks Turn 1 Red & Blue
Archetype Detection
Aggro-Combo Detected
14
01234+
Avg CMC
1.84
Land Count
19
Est. Turn Win
3.5
Smart Analysis

We know what your deck is trying to do.

An Aggro deck needs 14 untapped sources on Turn 1. A Control deck needs consistent land drops until Turn 4. OnCurve adjusts its math based on your deck's detected archetype.

Aggro Tuning
Control Stability

Used by deck builders

From FNM heroes to Pro Tour competitors.

PS
Pedro S.
Thopter Deck Enthusiast

"My thopter deck kept missing colored mana for key spells. OnCurve showed me exactly which lands to swap. Now my Thopter Foundry combo is consistent."

SL
Sebastián L.
Competitive Player

"Looking forward to using this for preparation for my next big PQ. Finally, a tool that gives me actionable insights, not just percentages."

AP
Alfonso P.
Big Collector & Cube Player

"As a big collector and cube player, I build a lot of decks. OnCurve helps me optimize mana bases across all my formats quickly."

JL
José L.
Tron Player

"I love playing my Tron deck, and OnCurve helped me fine-tune the mana base. Even with Tron lands, the colored sources need to be perfect."

PD
Percy D.
Theory Crafter

"I'm always theory crafting new deck ideas. OnCurve helps me validate my mana bases before I even sleeve up the cards."

Beta Access

Build your mana base
with confidence.

Analyze Deck Now
Auto-detect Format
Import from Arena

Frequently Asked Questions

Does this support Commander?
Yes, OnCurve supports 100-card singleton decks. However, the recommendations engine is currently optimized for 60-card competitive formats (Modern, Pioneer, Legacy) where consistency on turns 1-3 is most critical.
How do you calculate fetchlands?
We treat fetchlands as virtual sources. A Scalding Tarn counts as both a Blue and Red source (Turn 1, Untapped) if you have valid fetchable lands remaining in your deck list.
What about mana dorks and rocks?
In v1, we focus primarily on land sources. Mana creatures (like Birds of Paradise) and artifacts are counted as sources starting the turn *after* they are cast, assuming they survive.