Comparison Console
CIVIVI Synergy4 vs CRKT M21-14SF
EDC Knives comparison. Compare price, weight, specifications, materials, and real-world use case.
Command Brief
Recommended read
CIVIVI Synergy4 stands out as the lightest option for weight, with about a 11% gap from the closest alternative. CRKT M21-14SF stands out as the cheapest option for retail price, with about a 4% gap from the closest alternative.
Decision Signals
What stands out
CRKT M21-14SF stands out as the cheapest option for retail price, with about a 4% gap from the closest alternative.
CIVIVI Synergy4 stands out as the most expensive option for retail price, with about a 5% gap from the closest alternative.
CIVIVI Synergy4 stands out as the lightest option for weight, with about a 11% gap from the closest alternative.
CRKT M21-14SF stands out as the heaviest option for weight, with about a 12% gap from the closest alternative.
CRKT M21-14SF stands out as the shortest option for closed length.
CIVIVI Synergy4 stands out as the longest option for closed length.
CIVIVI Synergy4 stands out as the shortest option for blade length, with about a 1% gap from the closest alternative.
CRKT M21-14SF stands out as the longest option for blade length, with about a 1% gap from the closest alternative.
Specification Profile
Relative dimensions at a glance
Each axis is normalized against the largest raw value among the products in this comparison. Farther outward means a larger value, not necessarily a better result. Axes with an unverified value are omitted.
Price & carry
Retail price
US$115Most expensive
US$110Cheapest
Weight
144 g (5.08 oz)Lightest
161.59 g (5.70 oz)Heaviest
Dimensions
Blade length
100 mm (3.94 in)Shortest
101.35 mm (3.99 in)Longest
Overall length
237 mm (9.33 in)Longest
234.95 mm (9.25 in)Shortest
Closed length
137 mm (5.39 in)Longest
136.53 mm (5.38 in)Shortest
Blade thickness
3 mm (0.12 in)Thinnest
3.56 mm (0.14 in)Thickest
Materials & mechanism
Blade steel
Nitro-V
AUS 8
Handle material
G-10 Laminate
Aluminum
Finish
Black Blade Finish
Titanium Nitride
Lock type
Nested Liner Lock
Liner Lock
Opening method
Front Flipper
Flipper
Clip type
Tip-Up, Right Carry
Reversible Pocket Clip
Use case profile
Best for
Everyday Carry (EDC)CampingTactical UsePiercing tasks
Tactical useEveryday carryUtility cutting
Not best for
Unknown
Unknown
Common praise
Excellent edge retention of Nitro V steelSecure and reliable nested liner lockComfortable and durable G10 handleSmooth deployment with front flipperVersatile tanto blade for piercing and utilityGood balance of quality and price
Strong and lightweight aluminum handleEffective triple point serrations for cutting fibrous materialsSecure liner lock with automated safetyGood blade strength due to spear point design
Common complaints
Liner lock may be stiff and require practice to operate
Unknown
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